Hi Bluetti Team
Please can you confirm if the following battery configuration is acceptable for the AC500
AC500 + 2xB300s connected in series on the first AC500 battery connection port &
3xB300 connected in series on the second AC500 battery connection port. (So 5 batteries in in total.) For reference I have set this up and the AC500 recognises all 5 batteries and assigns them a ‘Battery Pack’ slot 1-5 and leaves one remaining. All seems to work fine with no current issues.
I ask the question because I was one of the original backers on the Indiegogo launch and there were many questions back and forth in the discussion forum which sort of indicated that if you mix B300 with B300s then the max would be 4 batteries in total as opposed to 6 if you connected all B300s
The Indiegogo FAQ section says
How many B300 battery packs can be connected to AC500 ？
Up to 4 B300
How many B300S packs can be connected to AC500 ？
Up to 6 B300S
Can B300S and B300 be mixed?
Yes. 4 packs in total.
What is the difference between B300S and B300?
Current capacity: 130A for B300S while 75A for B300.)
So you would assume from the above FAQ’s that 4 mixed batteries max due to the different/lower Amps for the B300.
However the Bluetti Team gave me further insight to one of my questions I asked in the Indiegogo Discussion section with the following answer - Quote ‘Hi Dean, When there are B300 and B300S connected to AC500 at the same time, the current can only be 75A, cannot reach to 130A. This is why the charging power and discharging power will be different when there is a B300 connected to an AC500. It is impossible to connect more than two B300s on one side. For safety reasons, we have restrictions. And it is also because when the B300 is connected, the current can only be 75A, and the longer the battery expansion cable, the smaller the current will be. Therefore, if you connect more than 2 B300s, it will be unstable or unable to connect. So as long as the AC500 is connected to the B300, the total number of battery packs can only be 4.
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Am I therefore correct in discerning from this is that the limitation of 2x B300s when mixed with any B300 is due to the BMS downregulating the 2x B300s 130A to 75A to match the B300? Which would mean that the AC500 can still recognise up to 3xB300 on the second battery connection port? (Still less than 4xB300 in total) as long as no more than 2xB300s are used in this configuration?
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Incidentally the reason for the question is that I backed/purchased the AC500 with 2xB300s as an upgrade to my existing AC300 + 3xB300 configuration. From this I planned to use 2 of my 3 B300 batteries with the AC500 + 2xB300s (thus 4 packs in total) and simply sell on eBay my spare (AC300 + 1xB300.) However now I have successfully connected AC500 + 2xB300s connected in series on the first AC500 battery connection port & 3xB300 connected in series on the second AC500 battery connection port. (So 5 batteries in in total.) I would like to keep this configuration whilst also keeping my AC300 as a spare/back-up in case there is ever a fault/issue with the AC500 in the future. I could still then revert to my old configuration of AC300+3xB300 if needed.
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So I suppose in a nutshell I simply need to know if from what I have explained if the following AC500 + 2xB300s connected in series on the first AC500 battery connection port & 3xB300 connected in series on the second AC500 battery connection port is indeed safe and acceptable to continue with?
Your answer to this is very much appreciated
Dean